Boiler-furnace.



No. 891,231. PATENTED JUNE 23, 1908.

W. GASSENS. BOILER FURNACE. APPLICATION FILED FEB. 28, 1905.

6 SHEETS-SHEET 2.

.JnvEntur. fyzw Wi Ln 5 s s e s No. 891,231. PATENTED JUNE 23, 1908.

. v w. OASSENS.

BOIBR FURNACE.

APPLI'OATION I B I .z

. L D 33 1905 ESHEETS-SHEET s.

Fig.3.

ll u

Witnesses. I inventor N .891 z 1. PATENTED JUNE 23 1908. o 3 w. GASSENS.

BOILER FURNACE.

APPLICATION FILED FEB. 28, 1905.

5 SHEETS-SHEET 6.

sTA EsrgrENT curious WILHELM (,ASSENS, ()l" BERLIN, ilCRMANY.

BOILER-FURNACE.

Applieation filed February 28, 1905. Serial No. 247,809.

To all whom it may concern:

Be it known that'I, WILImLM engineer, a subject of the Grand .Duke of Oldenburg and German Phnperor,residing at Berlin, in the Kingdom of Prussia and German Empire, have invented certain n ew and useful Improvements in BOllOT-FUTI'HLCOS, of which the following is a'specification.

My invention relates to an improvement in boiler furnaces in which smoking shall .be prevented by reutilizingapart of the waste gases in such a manner that the gases to be reutilized are mixed with fresh air and steam from a suitable steam source and are forced beneath "the grate, whence this mixture of waste gases, fresh air and steam pass to the .ing the combustion in the manner aboveindicated. Figs. 3 and 4 show awater-tube,

boiler likewise in vertical section and sec-, 'tional plan, embodying my improvements.

Fig. 5 shows in an enlarged scale part of the perforated tubing arranged below the grate. That portion of the furnace gases intended 'to be rev-utilized is led through the pipe 0 (Figs. 1 and 2) from the flue or passage d by means of a fan a, in the presentcase driven by an electro-motor b which draws atmospheric air through the pipes e, .e-. The pi e e lies across the path of the hot gases at the back of the boiler so that said gases circulating about the same strongly heat the air passing through said pipe. The inflowing air and the furnace gases are thoroughly mingled in the fan a and are forced through the pipe f into the box-like chambers i in front of the boiler fiues whence the hotmixture' of grate.

Each ash box contains a system of tubing extending throughout below the grate-surface which in the present case is shown. as a serpentine coil n and said tubing is preferably all round, but at least at top and bottom provided with a large number of orifices n n (Fig. 5) and said coil is connected with a suitable source of steam supply, for instance with the steam space in the interior of the (fxssnxs,

air and waste gases passes under the Specification of Letters Patent.

Patented June 23, 1908.

generator, so that the steam corresponding to the boiler pressure, will issue in line jets through the bottom perforat ons into the hot uuxture of a r and furnace gases filling the ash-box. This mixture passes to the glowing fuel on the grate k'only when it passes from the space beneath the coil into the.

space above the same. As however the jets from the pipe n are so directed that under the grate a mixture of air and steam is produced, the steam 1 jets issuing upwardly through the upper perforations of the coiln comes in contact with the mixture of the ash-box on the glowing fuel, only a part of the steam of these upwardly directed jets being distributed among the mixture already formed so as to increase the moisture thereof, or to saturate the mixture, while the other part flows as pure steam along with the-saturated mixture into the fire. There is immediately formed a sort of semi-watengas or power-gas and not only the unconsumed constituonts of the waste ases which have been i brought through the pipe 0 undergo combustion, but also the combustion of the fuel on the grate is assisted. of smoke is very considerablyreduced and of such smoke a ver considerable partfis led back again beneath the grate, so that the chimney is practically as The production of smdke can be further lessened by leading the hot mixture of furnace gas, air and steam which is produced beneath the grate, over the fire, either at both sides or behind the grate.

' In the construction shown in Figs. 1 and 2, behind thefire brid e Z is a so-oalled gasification bridge m and both bridges are provided with nozzles or passages directed towards one another which are sup lied from the ash-box, by means of suitab e connections, with the hot mixture of air, steam and waste gases. Under the pressure of the fan, jets assfupwardly and at inclinations downwardly into the smoke or exhaust gases leaving the grate, the unconsumed constituents of which are in this'way consumed so that only a minimum quantity of smoke passes into the fluef, of which a lar e proportion is drawn through the pipe 0 unrfer the action of the fan and again passed to the furnace as above described. V

"In the construction shown in Figs. 3 and 4 'the suction of the smoke from the flue and the conducting of the same back to the combustlon chamber takes place in much the Hereby the formation ood as smokeless.

same manner as that above described, only the mixture of air, steam and gas is led to a passage 0 in thefirebridge whence it passes through openings pinto'the ash-box. In this modification the part of the hdt mixture of furnace gases, steam and air which is led over the v grate passes at both sides of the furnace up ue or passage, of a fan, a pipe communicatmg with the passage and the fan, an air heating pipe located in the gas passage, said pipe communicating with the pipe leadin to the fan, a box-like chamber located in front of v the ash pit of the furnace and in comm unication therewith, a pipe leading from the f an to .said chamber, a systemof perforated tubing arranged below the grate and means for supplying said tubing with steam substantially as set forth and for the purpose described.

2. In combination with a boiler furnace provided with a grate, ash pit and an escape flue or passage, of a fan, a pipe communicating with the passage and the fan, an air heat ing pipe located in the gas passage, said pipe communicating with the pipe leading to the fan, a box-like chamber located in front of the ash pit of the furnace and in communication therewith a pi e leading from the fan to said chamber a per orated ser enti'ne-coil extending below the grate t roughout the length of the ash pit, said coil being connected with the steam space in the interior of the generator substantially as set forth and for the purpose described.

3, In combination with a boiler furnace provided with a grate, 'an ash pit and an escape flue or passage, of a fan, a pipe communicating with the fan, a bridge wall having rearwardly directed nozzles, a second bridge spaced from the-first and provided with forwardly directed nozzles, means connecting said nozzles with the ash-pit an escape flue or passage and a fan, an air heating pipe located in the gas passage said pipe communicating with the pipe leading to the fan a box-like chamber located in front of the ash pit of the furnace and in communication therewitha pipe leading from the fan into said-chamber a system of perforated tubing arranged below the grate and means for supplying said tubing with steam substantially as set forth and for the purpose described.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

' WILHELM CASSENS Witnesses:

lliunoLrn Voomms, GEO. Ninnnannn'. 

